Packing for pistons and piston-valves.



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j In No. 759,582. PATENTED MAY 10, 1904'. I V J. T. WILSON. PACKING FOR PISTONS AND PISTON VALVES,

. APPLIOATIOK FILED AUG. 10, 1903.

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UNITED STATES Patented May 10, 1904.

PATENT OFFICE.

PACKiNG FOB PISTONS AND PISTON-VALVES.

SPECIFICATION forming part of Letters Patent No. 759,582, dated May 10, 1904.

Application filed August 10, 1903. Serial No. 168,942. (No model.)

To all IL'IIIHIL it may concern: I

Be it known that I, JOHN T. \VILsoN, acitizen of the United States, residing at Jersey Shore, in the county of Lycoming and State of Pennsylvania, have invented new and useful Improvements in Packing for Pistons and,

Piston-Valves, of which the following is a specification.

The object of my invention is the production of a piston-packing for piston-valves and pistons which shall have rings so constructed and arranged that when the engine is working steam or other fluid motive power the position of the packing-ring relative to the bushing or inner surface of the cylinder will remain substantially unchanged throughout the entire stroke of the piston-valve or piston and the degree of frictional pressure of the outer or circumferential surface of the ring against the inner surface of a bushing or cylinder be substantially constant; which shall have the rings so constructed and arranged that when the engine is working steam the packing ring or rings will be rendered substantially solid or rigid; which shall have the rings so constructed and arranged that steam or other motive fluid can come in contact with the inner surface of the packing-ring and force it outwardly against a bushing or the inner su rface of a cylinder and not cause excessive friction: which shall have the rings so constructed and arranged that when the engine is not working steam the packing-ring will automatically adjust itself to the inner surface of the bushing or cylinder, and thus compensate for wear, and which, finally, shall have the rings so constructed and arranged that they will be durable and eflicient, obviate the necessity of special adjustment by hand, and, withal, possess many other desirable features and characteristics constituting the packing a superior means for p rforming the requisite functions.

'With the above ends in view my invention consists in a packing embracing a packingring, a wedge-ring, and a clamping-ring relatively so disposed that when motive fluid is admitted to the engine it will pass to the inner surfaces of the rings and will act upon the wedge-ring and packing-ring and change their diameters and by pressure render the packingring substantially rig d or solid.

It further consists in a packing comprising a packing-ring, a clam ping-rin g, and a wedgering, motive fluid being admitted to all the rings. 7

Finally, it consists in certain novelties of construction and combinations and arrangements of parts hereinafter set forth and claimed.

The accompanying drawings illustrate four pictured examples of the physical embodiment of my invention, which are constructed and arranged according tothe best of the several modes I have so far devised for the application of the principle.-

Figure 1 illustrates in section a piston or piston-valve, showing two sets of packingrings. Fig. 2 illustrates a half-section of an engine-piston with two sets of packing-rings and means forintroducing fluid motive power to each of said sets of rings from either side of the piston. Fig. 3 illustrates a half-section of a piston-valve provided with a wide packing-ring, a clamping-ring, and a relatively wide wedge-ring and means for allowing motive fluid to pass to the inner surfaces of the rings. Fig. 4 shows a modified construction of a piston-valve having two sets of packings and a ring interposed between them, also means for allowing motive fluid to pass to the inner surfaces of both sets of rings.

Referring to the several figures, the numeral 1 designates the body of a piston or a pistonvalve, which may be of any suitable construction; 2, removable rings secured to the body of the piston or piston-valve by bolts or otherwise; 3, bolts holding the rings to the body of the piston or piston valve; 4, recesses formed within the circumference of a piston or piston-valve, which recesses are adapted to receive and hold the packing; 5, a packing-ring; 6, a clamping or wall ring; 7, a wedge-ring, and 8 passages for steam to the under surfaces of the rings.

In Fig. 2 the numeral 9 designat s a movable valve which is located in a passage 10, enlarged at the center to hold the valve in posilion, the said valve having beveled ends to fit beveled eats, as shown. Vhen steam is admitted to one side of the piston, the valve of packing-rings and which closely fits the circumference of the end of the spool.

In the several examples I have illustrated by cross-lines the lap-joints of the packingrings and wedge-rings, and inasmuch as the joints may be of any suitable construction well known in the art I have not illustrated them in detail. In all cases the clamping or wall ring is integral and cannot appreciably expand, whereas the packing-rings and wedgerings may all expand under the pressure of fluid motive power and contract by their own resiliency when motive fiuid is shut off. 7

It will be observed that in all the examples motive fluid is admitted to the under surface of the packing-ring and the wedge-ring, that motive fluid when admitted acts upon the wedge-ring and packing-ring and changes the diameters, that the clamping-ring cannot appreciably change its diameter, but forces the packing-ring against the wall of the piston or piston-valve, which wall constitutes one of the boundaries of each recess, and that when motive fluid is shut off the packing-ring may automatically by its own resiliency adjust itself to the inner surface of the cylinder or bushing.

hile I have illustrated and described only four examples of the physical embodiment of my invention and in connection with pistonvalves and pistons, I do not thereby intend to limit its scope to such specific examples,

inasmuch as the principle can be embodied by other modes and in a multiplicity of forms and combinations. The form or shape and dimensions and arrangements of the several rings may be changed and, as before stated, any style of joint-plate or lap-joint be selected to form a closed joint, as they are not of the essence of my invention. Other modifications, as well as additions or omissions of parts or elements, 1 shall not regard as substantial departures provided those used are for securing the desired mode of operation.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a piston or pistonvalve, of a packing-ring, an integral elamping-ring, and a wedge-ring, there being apassage for steam to the under surface of all the rings.

2. The combination with a piston or pistonl valve, of a packing-ring, a non-expansible clamping-ring, and a wedge-ring; said rings being arranged in parallel planes and the nonexpansible clamping-ring being interposed between the packing-ring and the wedge-ring, and means for introducing motive fluid to the under surfaces of the packing and wedge rings.

3. The combination with a piston or pistonvalve, of a packing-ring, a. clamping-ring, and a wedge-ring; and means for admitting motive fluid to the under surfaces of all the rings.

4. The combination with a piston or pistonvalve, of a packing-ring, abeveled clampingring, and a wedge-ring, and means for admitting wwhgundeesurfacesof all the rmgs.

5. The combination with a piston or pistonvalve, of an expansible packing-ring, a nonexpansible clamping-ring, and an expansible wedge ring which bears against the clamping ring; said packing ring having a beveled surface which is in frictional contact with a beveled surface of the clamping ring, and means for admitting motive fluid to the under surfaces of the rings.

- 6. The combination with a piston or pistonvalve, of a packing-ring, a wedge-ring, and a clamping-ring, said rings being located in parallel planes within a groove and said piston or piston-val e provided with a motive-fluidadmission passage to the three rings from each side of the piszon or piston-valve.

7 The combination with a piston or pistonvalve, of two sets of packing-rings each comprising an expansible packing-ring, an expansible wedge-ring, and a non-expansible clamping-ring, a passage to the under surfaces of each set of rings from each side of the piston or piston-valve, and means consisting of a movable valve which prevents the of the piston or piston-valve when it is admitted from one of the sides to the under surfaces of the packings.

In testimony whereof I aifix my signature in presence of two witnesses.- I

JOHN T. WILSON.

Witnesses:

JOHN '1. Hum, Dom BOSWELL.

discharge of motive fluid to tne opposite side v 

